If wotking, you can withhold more

otherwise, you need to pay estimated tax if you owe more than $1k to IRS. The best is withholding as it is considered to be paid throughout the year. If you did not start to pay estimated tax on previous quater, you might still owe panelty (but better than without), so the tax planning needs to be started early in the year rather than later. Also, if you already paid enough tax within safe habor (norally 100% of last year liability or 90% this year), you should avoid pay IRS panelty. Similar requirement for state tax as well if any.